I got the SKS X-Blade early this year. I had to replace my old X-Tra-Dry non-adjustable fender once I installed a Joplin dropper post. The adjustability on the X-Blade is great. It felt a little pricey when I bought it, but it has been worth it.

I wrap a little duct tape around the seat post. My fender has a little texture in the part that goes around the seat post (might be the sks posted above - the orange strap has little nubbins on the inside). The texture digs in to the duct tape and the fender doesn't move.

I had the SKS before, but I haven't found a rear fender that works on the seat post now that I got a Gravity Dropper. There's not enough free post, which would be too low anyway. The rearward cable release gets in the way as well. Now I get a dirty muddy backside..

I've been using a Dakine Nomad. It can store food, tools, 3 liters of water and has no bike attachment problems. Downside is it only keeps a portion of my back clean.
For commuting the SKS one listed above is nice.